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Quinn itutrs gutem @ffice JOSEPH P. GATES, OF LINCOLN, ILLINOIS.--

Letters Patent N 72,014, dated December 10, 18671 IMPROVEMENT, IN TIGHT AND LOOSE PULLEYS.

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TO ALL WHOM IT MAY CONGERN: l L

Be it known that I, JOSEPH P. GATES, of Lincoln, county of Logon, and State of Illinois, have invented new und useful Improvements in Tight and Loose Pulleys ;'and I do hereby declare the following to be an exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, milking u. 'part of this specification, in which- Figure 1 represents o side elevtion,

Figure 2 a. cross-section, und

Figures 3, 4, and 5 are the inside views ofthe pulley.

The nature of my invention consists in the construction of the pulley intwo sections, with their arrungev ment und combination of'deviccs operated as hereinafter described.

A, the shaft of loose 'pulley e; B, the inner seat' for the outer-section of pulley to revolve; C, deeper part ofl shuttle-key recess; D; the seat on which the easc-dog'vibrates; E, a, depressed recess for the euse-dog` ram and ram-spring; F, the rnm spring; G, the rebound-guard; H, a. plane between the recess E and plone of elevation of D; I, o. stop flange that limits the vibration and sweep of the ense-dog; J, the ease-dog, with its spring K, that relieves the shock o'f the4 connection of thetwo sections of the pulley; L, -the euse-dog ram, with its spring F, that breaks the shook of the rebound of thc case-dog, when the two sections of the pulley aredisengnged; M, the anchor that holds the one end of the spring K; N, n stop-nib on the ease-dog; 0, bearing jour nul; P, the shuttle-key, of semicircular shape; Q, the shoulder on the shaft against the buck of the pulley; R,

the shuttle-key ratchet; S, a. guide; T, the ratchet-dog; U, a. bnrncross shuttle-key; V, o circular sunk recess `for pussngc'of the stop-nib N; W, a. raised side foce of periphery of pulley; X, extreme periphery of centre of belt-foce of pulley; Y, the bearings of shnftA; Z Z orestuds on shuttle-key P; e, screw-nut on shaft ugainstthe front of pulley; a, a cem that operates the shuttle-key studs Z, to throw thetwo sections ofthe pulley in and out of connection when required; b, the arm on which the cam a is set, and by u'hich the cam is moved to or from the shaft; d, n driving-band wheel; e, the tight and loose pulley; f, thebelt. l

When the pulley c, with all its devices, und with the shuttle-key P, cam'a, and cum-arm b, are in position,`

and mounted upon the shaft A of n mnchinc intended to be `propelled, upply to it the beltf, from n. revolving bund-pulley, d, `und the shaft on which the loose pulley e is fixed at once ,receives the motion ofthe drivingpulley el. By moving the cam-arm b with its com a towards the shaft ,the com a is brought in contact with the studs Z Z of the shuttle-key P\i'hich disconnects the shuttle-key P `from the stop-nib N on the ease-dog J; which disconnects the outer section from thc inner section ofthe pulley. In this condition the outer` section of thc pulley revolves freely in the ,belt upon the scat B, on the inner section of thc pulley, leaving the shaft at rest. as if the belt had been shifted on to n loose pulley. The disconnection of thetwo sections o'f the pulley relieves the spring K, of the euse-dog J, of considerable tension, the redaction of whichbrings the cese-dog J und ram L against thcrnm-spring E, which receives and breaks the shock of the rebound. To x the tivo sections of the pulley in connection, move the com-arm Z1 from'thc shaft, which brings the com a in Contact with the studs Z Z, which throws the shuttlejkcy P outward, so that in its enlarged sweep, it engages the stop-nib N, (on the case-dog J,) and overcoming the tension of its spring K, presses it round to the stop-ange which completes the connection, being relieved by the tension of the euse-spring K, and the shaft revolves with the pulley us nt first. v

What I claim as my invention, and desire to secure by Letters Patent, xs-

Thc construction ofthe pulley e in two sections, "ith the arrangement und combination of the ram-spring F, the rebound-guard G, the stophmge I, the euse-dog J, und spring K, the ease-dog ram L, the shuttle-key P, and studs Z, and arm b, with com a, when constructed, arranged, and operated as herein described, and for the purposes set forth.

JO. 'P. GATES.

Witnesses:

J. FRANKLIN Rnronnr, EDM. F. BROWN. 

